(a) once in a lifetime (trip): (a trip) which one will only be able to do once in one's entire life idiom
(You only meet Bruno Delavigne) once in a lifetime!: It is extremely rare or unusual (to meet Bruno Delavigne!) idiom
  • "Bruno : Once-in-a-lifetime opportunity?"
  • "Thank you ever so much for this once in a lifetime opportunity."
  • "Clients like Steffi are once in a lifetime, Quincy."
  • "Thank you ever so much for this once-in-a-lifetime opportunity."
  • "I've already been burnt at least twice by once-in-a-lifetime opportunities."
  • "You don't know me, and we've never done business together, but believe me, this is a once-in-a-lifetime opportunity."

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